Before the well-meaning but condescending comments arrive: no, I was not 'doing it wrong. If my experience threatens anyone's romantic view of meditation, kindly keep it to yourself.
Post them, or it will be safe to assume you are lying in reaction to the threat to your ego.
(1). Wong, S. Y., et al. (2018). The Safety of Mindfulness-Based Interventions: a Systematic Review of Randomized Controlled Trials. Mindfulness, 1-14.
(2). Creswell J.D. (2017). Mindfulness Interventions. Annual Review of Psychology. 68: 491–516.
(3). Shonin, et al. (2014). "Are there risks associated with using mindfulness in the treatment of psychopathology?". Clinical Practice. 11 (4): 389–92.